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mm/kasan: Increase size alignment

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The following situations cannot be detected by Kasan:
On a 32-bit machine, only 12 bytes were poisoned, but 13 bytes were accessed. Due to the lack of upward alignment, only 3 bits were detected

Signed-off-by: wangmingrong1 <wangmingrong1@xiaomi.com>
This commit is contained in:
wangmingrong1
2024-09-09 12:17:56 +08:00
committed by Xiang Xiao
parent b7d5a30f85
commit 4473f2f847
1 changed files with 2 additions and 0 deletions
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mm/kasan/generic.c
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@@ -24,6 +24,7 @@
* Included Files * Included Files
****************************************************************************/ ****************************************************************************/
#include <nuttx/nuttx.h>
#include <nuttx/mm/kasan.h> #include <nuttx/mm/kasan.h>
#include <nuttx/spinlock.h> #include <nuttx/spinlock.h>
@@ -210,6 +211,7 @@ bool kasan_is_poisoned(FAR const void *addr, size_t size)
nbit = KASAN_BITS_PER_WORD - bit % KASAN_BITS_PER_WORD; nbit = KASAN_BITS_PER_WORD - bit % KASAN_BITS_PER_WORD;
mask = KASAN_FIRST_WORD_MASK(bit); mask = KASAN_FIRST_WORD_MASK(bit);
size = ALIGN_UP(size, KASAN_SHADOW_SCALE);
size /= KASAN_SHADOW_SCALE; size /= KASAN_SHADOW_SCALE;
while (size >= nbit) while (size >= nbit)